<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    div {
      border: 1px black solid;
    }

    #contentDiv {
      width: 800px;
      height: 200px;
      margin: auto;
    }

    #menuUL {
      display: flex;
    }

    #menuUL li {
      list-style: none;
      width: 150px;
      height: 30px;
      text-align: center;
      cursor: pointer;
      padding-top: 5px;
      border-radius: 5px;
      position: relative;
    }

    #menuUL li:hover {
      font-weight: bold;
      background-color: yellow;
      color: red;
    }

    #menuUL li div {
      width: 150px;
      height: 200px;
      position: absolute;
      background-color: aquamarine;
      display: none;
    }

    #menuUL li:hover div {
      display: block;
    }
  </style>
</head>
<body>
<div id="contentDiv">
  <ul id="menuUL">
    <li>新闻
      <div>
        没有什么能够阻挡<br>
        我对自由的向往<br>
        除非疫情
      </div>
    </li>
    <li>财经
      <div>
        没有什么能够阻挡<br>
        我对自由的向往<br>
        除非疫情
      </div>
    </li>
    <li>体育
      <div>
        没有什么能够阻挡<br>
        我对自由的向往<br>
        除非疫情
      </div>
    </li>
  </ul>
</div>
</body>
</html>